<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>WebSocket通讯</title>
</head>
<script src="./js/jquery-3.3.1.js"></script>
<script>
    var socket;

    function openSocket() {
        if (typeof (WebSocket) == "undefined") {
            console.log("您的浏览器不支持WebSocket");
        } else {
            console.log("您的浏览器支持WebSocket");
            // 实现化WebSocket对象，指定要连接的服务器地址与端口  建立连接
            // 等同于socket = new WebSocket("ws://localhost:8888/xxxx/im/25");
            // var socketUrl="${request.contextPath}/im/"+$("#userId").val();
            var socketUrl = "http://localhost:9090/ws/websocket/" + $("#userId").val();
            socketUrl = socketUrl.replace("https", "ws").replace("http", "ws");
            console.log(socketUrl);
            if (socket != null) {
                socket.close();
                socket = null;
            }
            socket = new WebSocket(socketUrl);
            //打开事件
            socket.onopen = function () {
                console.log("websocket已打开");
                //socket.send("这是来自客户端的消息" + location.href + new Date());
            };
            //获得消息事件
            socket.onmessage = function (msg) {
                console.log(msg.data);
                //发现消息进入    开始处理前端触发逻辑
				$("#toText").html(msg.data);
            };
            //关闭事件
            socket.onclose = function () {
                console.log("websocket已关闭");
            };
            //发生了错误事件
            socket.onerror = function () {
                console.log("websocket发生了错误");
            }
        }
    }

    function sendMessage() {
        if (typeof (WebSocket) == "undefined") {
            console.log("您的浏览器不支持WebSocket");
        } else {
            console.log("您的浏览器支持WebSocket");
            console.log('{"toUserId":"' + $("#toUserId").val() + '","contentText":"' + $("#contentText").val() + '"}');
            socket.send('{"toUserId":"' + $("#toUserId").val() + '","contentText":"' + $("#contentText").val() + '"}');
        }
    }
</script>
<body>

<div id="head-user">
    【发起者ID】<input id="userId" name="userId" type="text" value="10"><br/><br/>
	【接收者ID】<input id="toUserId" name="toUserId" type="text" value="20"><br/><br/>
	【发送消息】<input id="contentText" name="contentText" type="text" value="hello websocket"><br/><br/>
	【接收消息】<span id="toText" name="toText" type="text" value=""></span><br/><br/>
</div>

<div>
	【操作】:<button onclick="openSocket()">开启socket</button>&nbsp;&nbsp;<button onclick="sendMessage()">发送消息</button>
</div>
</body>

</html>